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That's how Shania Twain recalls feeling when she found out her husband and her best friend were having an affair. "I'd been pushed off my own bus, and it was going full speed ahead," she says on the upcoming episode of Why Not? With Shania Twain this Sunday (May 15) on the Oprah Winfrey Network. It's the most candid she's been about that unthinkable betrayal. She adds that the friend, Marie-Anne Thiebaud, was a great actress. "She deserves an Academy Award," Twain says. But the episode is not all about the bad and the ugly. There's plenty of good. It shows Twain going back to a one-room cabin she used to rent in Ontario when she was working part time at Sears, saying, "It's a good reminder of where I'm from and who I am. I'm always wishing for a smaller life." Then she spends a day -- skydiving of all things -- with a woman who has been through a similar rough patch. Twain explains that going through the experience of fear together is a good way to bond and maybe, hopefully, find some peace.